SECTION 3: OSCOR MANUAL OPERATION
REI OSC-5000E 58
LOCATING A THREATENING TRANSMITTER
Once a signal has been identified as an eavesdropping device (or a video transmitter),
the next step is to locate the threat signal.
Locating Low Frequency RF (10 kHz - 500 kHz) Transmitters
Low frequency RF signals (10 kHz to 500KHz) are not very practical frequencies for
bugging devices because of the extremely large antenna size required for transmission.
For this reason, it may be a better idea to rely on other equipment to find low frequency
devices such as an NLJD (ORION) or a broadband detector (CPM-700).
However, the OSCOR does provide the capability to search for low frequency signals.
These types of signals often emit from video cameras (15kHz) or the low frequency
magnetic signals emitted from tape recorders with bias oscillators. The OSCOR uses the
loop antenna and may be tuned between 10KHz and 500KHz.
WARNING: Digital recorders and most modern tape recorders do not contain bias
oscillators, and therefore, this detection process is not valid. However, it is still included
here to make the user aware of the capability.
FIGURE 35 REMOVED LOOP ANTENNA
To locate a low frequency signature:
1. Remove the loop antenna from the antenna panel.
2. Patch the separated loop antenna to the antenna panel using the 12ft 3.5mm
patch cord.
3. Place the OSCOR in the Analyze Mode (using the SWEEP/ANALYZE button) with
the TAPE REC input (for tape recorder bias oscillator detection) or RF Loop (for
low frequency signals such as 15KHz video signatures) selected (using the F1
button).
4. Press the THREAT button to bring up the Threat Locator Menu.
5. Press the F1 button to turn on the locator function (labeled “Probe On”).
6. Adjust the volume control to an acceptable level. You will hear a buzzing sound.
7. Adjust the squelch level (indicated by a horizontal dotted line) to just above the
noise threshold at 40 kHz.
8. With the loop antenna, manually sweep over any object that may contain a tape
recorder. (The loop antenna needs to be within about 3 ft for good signal
reception.)
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